List of The Legend of Korra episodes

This is the list of episodes for the animated television series The Legend of Korra. The series premiered on April 14, 2012. Like its predecessor Avatar: The Last Airbender, the series classifies each episode as a "chapter", but unlike the previous series, where each season was one "book", The Legend of Korra has two seasons, comprised of two distinct "books" each. The list is ordered by release dates from the original airings in the United States.

After averaging 3.9 million viewers for Book One: Air, The Legend of Korra received an order for twenty-six more episodes in July 2012. The show returned on September 13, 2013 with the television debut of the first two episodes of Book Two: Spirits. The first book of the second season, titled Book Three: Change, began airing on June 27, 2014, and ran for thirteen episodes. After a brief break, the fourth and final book, titled Book Four: Balance, premiered on October 3, 2014 and also ran for thirteen episodes.

Contents

Episodes

Book One: Air

The first two chapters comprised the series premiere.[1] As part of a special preview, these were made available on the site KorraNation.com during the weekend of March 24 and 25, 2012, twenty-one days before the official premiere. Nickelodeon also released the first part of the second episode of the series for online viewing on April 2, 2012, twelve days earlier than the television air date.[2] After both earlier releases, iTunes released a season pass and the first two episodes on April 3, 2012. For a short period of time, episodes one and two were available for free downloading. Episodes are available in both high definition and standard definition.[3] All early releases were exclusive to the United States.

Frustrated with her failed attempts to master airbending on Air Temple Island, Korra disobeys her teacher, Tenzin, and shifts her focus to Republic City's famous Pro-bending Arena. There, she befriends the brothers Mako and Bolin, who compete in pro-bending matches on their team, the Fire Ferrets. When their waterbender leaves the team, Korra steps up and takes his place.

Mako and Bolin look for ways to acquire the thirty thousand yuans required for their team to remain in the Pro-bending Tournament. Bolin finds himself in a dangerous situation after accepting a job from the Triple Threat Triad. Worried, Korra and Mako search for him and they learn of an upcoming Equalist rally. Attending the mass meeting, Korra learns more about the anti-bending movement and their mysterious leader, Amon, though are forced to intervene in order to save Bolin's bending abilities.

Mako meets Asami Sato in a small accident, leading to a romantic date and her introducing him to her father, Hiroshi Sato, who offers to sponsor the Fire Ferrets in the Pro-bending Tournament. Meanwhile, Korra is coerced into joining CouncilmanTarrlok's task force, intending to rid the city of Equalists. She later challenges Amon to a duel at Aang Memorial Island, which ends up being a trap, during which he warns her of his upcoming plans.

The pro-bending championships begins, with the Fire Ferrets getting off to a good start. However, Korra and her teammates struggle to work together after romantic rivalries shake their foundation and threaten to end their shot at the championship.

Korra and the Fire Ferrets prepare for the pro-bending championship final as the growing Equalist movement threatens to force the tournament's cancellation. At bidding of the Avatar and ChiefLin Beifong, the United Republic Council disregards the threat, resulting in dire consequences for the Pro-bending Arena, the tournament's competitors, and its bending spectators.

Saikhan's appointment as Chief of the Metalbending Police Force signals the tightening of Tarrlok's control over the city. Mako, Korra, Bolin, and Asami form Team Avatar and impede the Councilman's plans, much to his displeasure. Korra confronts Tarrlok late at night, resulting in Tarrlok's exposure as a bloodbender. In order to keep his secret, he captures the Avatar.

Korra tries to meditate on the visions of Aang's life that have been plaguing here while being confined in an unknown area. Meanwhile, after hearing from Tarrlok that Korra had been captured by Equalist, Tenzin, Lin Beifong, and Team Avatar set out to find her, leading to the discovery of an underground Equalist base where several police officers where held captive. At Tarrlok's hideout, Amon and his Equalist arrive. After Tarrlok's bending is stripped by Amon, Korra sees the opportunity to escape and finds her way back to Republic City.

Mako's doting over a recovering Korra puts a strain on his relationship with Asami. In the city, Tenzin fights off a kidnapping attempt of the Equalists and ends up the sole council member left, prompting him to request help from the United Forces. When Republic City comes under attack from Equalists, Team Avatar takes action. Back at Air Temple Island, Pema goes into labor while Lin Beifong and the three airbending children manage to defend the island. When more Equalists come, the islanders are forced to run, with Team Avatar retreating in the city's sewers, while Tenzin, his family, and the Air Acolytes flee on the sky bison. In order to secure the airbenders' safety, Lin fights off the Equalists, which leads to Amon taking her bending.

From their underground base, Team Avatar spies on the Equalist activities while awaiting the arrival of GeneralIroh's fleet. After the fleet is destroyed by Equalist biplanes, Team Avatar splits up; General Iroh, Bolin, and Asami set out to destroy the airfield, while and Korra and Mako go to face Amon. Once the duo, donned in an Equalist attire, arrives at Air Temple Island, Korra and Mako find an imprisoned Tarrlok, who reveals that Amon is in fact his brother, Noatak, a Northern waterbender, and the son of Yakone.

Korra and Mako are set to expose Amon's true identity to his followers, but discover that he has captured Tenzin and his family. Amon baits her and succeeds in taking Korra's bending except for airbending, since she had not yet unlocked the fourth element. After using her last element to expose Amon's true identity, the Equalist leader flees the city with Tarrlok, who uses an electrified glove to blow up their speedboat. Meanwhile, Iroh managed to take down the airplanes that had taken flight, while Asami and Bolin took care of the grounded vehicles and captured Hiroshi. Although Katara failed to restore Korra's bending, the Avatar manages to finally establish a link to her spiritual side and Aang helps her to unblock her bending, which gives Korra the ability to energybend and restore the bending abilities of others. Korra and Mako admit their feelings toward each other, starting their relationship.

Book Two: Spirits

Book Two debuted on Nickleodeon on September 13, 2013, with a double episode, as had been done in the previous book. During its run, eight episodes aired as part of hour-long specials, and select episodes were screened in advance at the San Diego and New York Comic-Cons. In addition, after the series' fans completed a challenge from Korra Nation on Tumblr, the final two episodes of the book were uploaded to Nick.com at midnight on November 16, six days before their television debuts.

Team Avatar and Tenzin's family travel to the Southern Water Tribe to attend the Glacier Spirits Festival. While there, Korra's uncle, Unalaq, informs her of the spirits that have been attacking ships in around the Southern Water Tribe and offers to train her in the ways of the spirits. Tension between Korra and Tenzin and Tonraq reach a breaking point after a dark spirit attacks them and Unalaq is the only one who is able to subdue it; Korra breaks off her studies under Tenzin and takes up Unalaq as her instructor.

Korra begins her spiritual training under Unalaq, who leads her to the South Pole to open up the spirit portal residing deep within the frozen tundra. Mako, Bolin, Tonraq, Desna, and Eska come along as well. Tensions between Korra and her father grow as she discovers the truth about his banishment from the North after having destroyed a sacred spirit forest. After another spirit attack, Korra sends her father home and continues with her quest to open the portal, which she successfully completes. However, Northern forces have arrived at the Southern Water Tribe.

Korra tries to remain neutral as tensions flare between the Northern and Southern Water Tribes. However, things are complicated when the Southerners talk about preparing for war and a group of rebels try to kidnap Unalaq, forcing Korra to intervene. The rebels are arrested, as well as Tonraq and Senna. Meanwhile, at the Southern Air Temple, Tenzin, Bumi, and Kya all search for Ikki who has run away after being teased by her siblings.

During a trial, Senna is the only one released, while all the others are condemned to life imprisonment. In an attempt to get Judge Hotah to release Tonraq, Korra discovers that Unalaq had set up the trial and his brother's banishment, causing her to break away from him and his teachings. With Varrick's help, she and Team Avatar free all the rebels. Meanwhile at the Southern Air Temple, Tenzin finds Ikki and they reconcile with their respective siblings.

Team Avatar travels back to Republic City in an attempt to gain support for the Southern Water Tribe from the United Forces, but her request is denied by PresidentRaiko. Tensions rise when the Southern Water Tribe Cultural Center is bombed, all evidence pointing toward the Northerns as the culprits. Mako, now a cop, is the only one doubting the Northerners' responsibility. Rising tensions between Mako and Korra lead them to break up. While Bolin becomes the star in Varrick's propaganda mover, Korra heads toward the Fire Nation to gather support there. Before she can reach the shores, however, she is swallowed by a dark spirit.

When criminal activity threatens to put Future Industries out of business, Mako sets up a sting operation in an attempt to arrest the culprits. The plan backfires, however, as it drew them away from the company's warehouse when it was being robbed. Mako investigates further and discovers the true culprit when he notices Varrick's mover technicians use the same type of detonators as he found during the bombing of the Southern Water Tribe Cultural Center.

In order to cleanse herself from a dark spirit's attack, Korra must reconnect with her Avatar Spirit. To do so, she needs to learn about the origins of the first Avatar, Wan. He shows her how he received the power of fire and learned the ways of the spirits, as well as how he was the one responsible for unleashing Vaatu, the spirit of darkness, into the world.

Wan shows Korra how he learned the other three elements and the reason why he eventually merged with Raava and became the first Avatar. His story makes Korra realize what she must do to restore balance to the physical and spirit worlds. As she wakes up, she is alerted by the shaman that Harmonic Convergence is drawing near.

Korra seeks Tenzin's help to enter the Spirit World for the first time in order to close to Southern spirit portal from within. However, their attempts prove to be futile until Jinora comes to Korra's aid. Meanwhile, Mako and Asami rekindle their relationship, but Mako's investigation into Varrick's affairs lead to the firebender's arrest.

After successfully arriving in the Spirit World, Korra and Jinora get separated. Jinora ends up at Wan Shi Tong's Library, where she tries to locate the spirit portal, though end up captured by Unalaq. Meanwhile, Korra finds herself in a dark forest, where she reverts to her four-year-old self and encounters Iroh's spirit. With the help of the former Fire Nation general, she helps a lost dragon bird spirit, who in turn helps her to find the spirit portals. Before she can close the Southern portal, however, she is forced by Unalaq to open the Northern portal, lest he destroys Jinora's soul. While Korra makes it back safely, Jinora remains trapped in the Spirit World

At the South Pole, Tonraq and his rebels are defeated by Unalaq and his forces. Meanwhile, in Republic City, Bolin prevents four waterbenders from kidnapping PresidentRaiko and his wife. After a brief battle, the earthbender forces one of the men to reveal Varrick as the mastermind behind the plot, leading to his arrest. With Mako's allegations proven correct, he is released from prison. Korra and Tenzin and his family return to Republic City to gather reinforcements to travel South in order to stop Unalaq from freeing Vaatu and destroying the world. When Raiko refuses to send the United Forces, Mako, Bolin, and Asami accompany them instead on Varrick's battleship.

After leaving Jinora's spiritless body in Katara's care, Korra and her friends attempt to break through the Northern defenses in order to reach the Southern spirit portal. Although initially unsuccessful, they manage to enter the Spirit World, where Bumi, Kya, and Tenzin leave to find Jinora's spirit, while Mako and Bolin hold back Unalaq in order to give Korra the time to close the portal. However, Harmonic Convergence starts before she can do so and Vaatu manages to break free from his prison inside the Tree of Time.

Korra cannot prevent Vaatu and Unalaq from merging and forming the Dark Avatar, and the two Avatars lock into a battle for the fate of the world. Vaatu manages to extract Raava from Korra's body and destroys the Light Spirit, effectively severing Korra's connection to her past lives. Having defeated Korra, the Dark Avatar grows to enormous proportions and makes his way toward Republic City. Meanwhile in the Spirit World, Bumi, Kya, and Tenzin manage to track down and save Jinora's spirit from the Fog of Lost Souls. However, before they can return, Jinora senses that Korra is in trouble and leaves her family in order to help.

Tenzin urges Korra to connect with her own inner spirit in order to defeat Unalaq. While meditating in the Tree of Time, she manages to tap into the energy of the universe and astrally projects herself, instigating a fight with Unalaq at Republic City. After an intervention by Jinora's spiritual projection, who illuminates Raava's presence within the Dark Avatar, Korra manages to extract Raava from him, before using his spirit bending technique to dissipate the Dark Avatar. She returns to the Spirit World, where Korra uses the last energy of the Harmonic Convergence to permanently merge with Raava again, though her connection to her past lives was not restored. Korra leaves both spirit portals open, ushering the world into a new era where spirits and mankind can coexist. She also declares the Southern Water Tribe independent.

Book Three: Change

Book Three debuted on Nickelodeon with the first three episodes on June 27, 2014, followed by two episodes each on July 11 and July 18. The book moved to online release after the eighth episode aired on July 25, with one episode per week until the two-part finale on August 22. The final five episodes eventually aired on Nicktoons Network just after the premiere of Book Four.

During the two weeks following the events of Harmonic Convergence, Korra has her hands full with trying to remove all the spirit vines that have overgrown Republic City. Her lack of success strains her relationship with President Raiko and brings down her approval rate among the city's populace. When airbenders are suddenly popping up across the world and causing more trouble for the city, President Raiko demands Korra to leave the city, which she takes as an opportunity to travel the world to find the new airbenders. Meanwhile, a dangerous criminal uses his newfound airbending abilities to escape.

Team Avatar, Tenzin, and Jinora travel across the Earth Kingdom to recruit new airbenders to rebuild the Air Nation, but with little success as they were only able to convince a young boy named Kai to join them. Meanwhile, Zaheer travels across the four nations to free Ghazan and Ming-Hua from their prisons. Upon learning of their escape, Lord Zuko sets course for the Northern Water Tribe himself in an attempt to stop them from freeing their last member, P'Li.

Team Avatar arrives in Ba Sing Se. While Korra has an audience with the Earth Queen, who demands her to go collect tax money from a small village as a condition for the Queen's help to track down airbenders in the city, the others notice that Kai has gone missing, prompting Mako and Bolin to go look for him. The brothers track him down, but he manages to shake them in the monorail, which takes the brothers to the Lower Ring, where they eventually run into their family from their father's side. Meanwhile, Korra and Asami collected the Queen's money, though the Queen brushes Korra off, leaving the Avatar to storm out of the palace. In the city, Kai finds himself arrested by the Dai Li and subsequently conscripted in the Earth Queen's first airbending regiment.

Lord Zuko, Chief Tonraq, and Chiefs Desna and Eska face Ghazan, Zaheer, and Ming-Hua in an attempt to stop them from freeing P'Li, though without success. Meanwhile, Mako and Bolin reveal that the Earth Queen is capturing all the airbenders and with Jinora's help, Team Avatar discovers the location of their prison. Despite Lin's warning to Korra that Zaheer and his companions have escaped, causing her life to be in danger, Korra refuses to leave Ba Sing Se without having freed the airbenders. Working together, Team Avatar succeeds in the prison break and they flee the Earth Kingdom capital. Tenzin, Jinora, and the airbenders head toward the Northern Air Temple, while Team Avatar and Lin continue their quest through the Earth Kingdom to find more airbenders.

Korra's quest to find new airbenders leads Team Avatar and Lin Beifong to the city of Zaofu, home of the Metal Clan. There they meet up with Suyin, Lin's half-sister, whose daughter, Opal, is the new airbender. While Opal and Bolin form an instant connection, tension between Lin and Suyin runs high as they have not had contact in thirty years. Meanwhile, in Republic City, Zaheer infiltrates Air Temple Island in an attempt to find the Avatar's whereabouts, though is eventually exposed by Kya, forcing him to flee.

Korra begins to learn metalbending under the instruction of Suyin. Opal admits her reluctance to leave Zaofu due to her obligations to her family while Bolin deals with his fear of learning how to bend metal. Meanwhile, Lin faces her past during an acupuncture sessions, forcing her to relive the circumstances which led to her and Su's strained relationship. After a cathartic release of her repressed emotions, Lin makes amends with her sister as well as Opal, who she convinces to travel to the Northern Air Temple to train with Tenzin. Elsewhere, Zaheer and his group determine Korra's whereabouts shortly after escaping Republic City, deducing that she is under the Metal Clan's protection in Zaofu.

Tenzin attempts to train the new members of the Air Nation with little success. Things become more complicated for the airbending master as Jinora, with Kai's influence, begins to exert her independence and demand her airbending tattoos. The new airbenders are tested when they are forced to face a group of bison rustlers who have captured Jinora and Kai along with several flying bison calves.

After Team Avatar and the Beifong family say farewell to Opal as she departs to the Northern Air Temple, Zaheer and his group infiltrate the city of Zaofu, in an attempt to kidnap Korra. Their failed attempt results in an investigation on behalf of Team Avatar, who discover that the mole is Aiwei. The truth seer managed to evade arrest and destroys any possible incriminating evidence in the process. Intent on standing up to the Red Lotus, Team Avatar leaves the city in an attempt to track them down.

After tracking Aiwei to the Misty Palms Oasis, Korra ventures into the Spirit World, where Zaheer distracts her by telling her about the origins of the Red Lotus and their goals. After being alerted by their leader, Ghazan and Ming-Hua travel to the Misty Palms Inn to capture Korra. While Asami escapes with Korra's unconscious body, Mako and Bolin hold off the two members of the Red Lotus, which eventually leads to their own capture. Although Asami manages to evade her pursuers, she and Korra are arrested by the Earth Queen's forces.

While en route to Ba Sing Se, Korra and Asami manage to escape from their cell, but their attempt to take control of the vessel results in it crashing in the Si Wong Desert. After the airship gets completely destroyed, Asami engineers a sand-sailer out of scrap metal and with Korra propelling the vehicle, the two girls and the four man crew make it out of the Si Wong Desert. Meanwhile, in Ba Sing Se, Mako and Bolin are imprisoned while the Red Lotus strikes a deal with Earth Queen Hou-Ting. However, she eventually ends up being killed by Zaheer, who subsequently has Ghazan take down the city's inner walls. He releases Mako and Bolin under the condition that they deliver a message to Korra.

While Ba Sing Se erupts in chaos, Mako and Bolin commandeer an airship and set course for the Si Wong Desert to find Korra and Asami. While flying over the Lower Ring, they stop to take their family with them, saving them from the flames that are consuming the city. They eventually track their friends down to the Misty Palms Oasis, where they reunite and relay Zaheer's message: Korra in exchange for the survival of the Air Nation. In an attempt to warn Tenzin of the Red Lotus' approach of the Northern Air Temple, Team Avatar heads back to Zaofu to use their radio transmitter and prepare for takeoff toward the temple. The warning comes too late, however, and the Red Lotus manages to capture all the temple's inhabitants. Tenzin, Kya, and Bumi try to fight off Zaheer, Ming-Hua, and Ghazan respectively, but are eventually overpowered. Although Kai nearly sacrifices himself to help the airbenders reach the bison stables and escape, P'Li manages to corner them all.

Korra turned herself over to Zaheer to save the airbenders who are held captive by the Red Lotus. But she and her friends got double-crossed by Zaheer's group. As Ghazan tried to bring down Korra's friends, Bolin saved the day by his new-found lavabending skills. However, he's not the only one who acquired new skills. Zaheer unlocked the ancient ability of flight and successfully captured the Avatar.

After succumbing to the poison, Korra enters the Avatar State and battles Zaheer, while Bolin and Mako duel Ghazan and Ming-Hua. The captive members of the Air Nation escape and band together to help Korra and defeat Zaheer, who they manage to recapture. However, the poison in her system forces Korra in a wheelchair and the young Avatar slips into a state of depression. Jinora is anointed as an airbending master by Tenzin, who also proclaims that the Air Nation will return to its nomadic roots and serve as the world's ambassadors for peace and balance.

Book Four: Balance

Book Four debuted on Nick.com and the Nick App on October 3, 2014, with one episode released every week until the two-part series finale on December 19. Like the previous book, Book Four's episodes made their television debuts on Nicktoons Network, running on Fridays from November 28 to December 19.

In the three years after the Insurrection of the Red Lotus, Republic City has come to terms with the spirits living in the metropolis, Kuvira and Baatar Jr., along with their supporters, have traveled the Earth Kingdom in an attempt to reunite it under her militaristic rule, and the Air Nation assists there where needed. By 174 AG, Asami Sato helped modernize Central City Station and Prince Wu is groomed to ascend the vacant Earth Kingdom throne with Mako momentarily serving as his bodyguard. Meanwhile, Kai and Opal stop a robbery in the State of Yi, though are unable to restore the town's supply lines, leaving the reluctant governor no other choice than to agree to Kuvira's terms for help and hand over the town to her command. Korra was set to reunite with Team Avatar in Republic City, but has been traveling alone for the past six months, making a rough living with earthbender cage fighting while hiding her identity as the Avatar.

While being haunted by a shadow of herself in the Avatar State, Korra reminisces about the hardships she went to in the course of three years. In 171 AG, she retreated to the Southern Water Tribe in an attempt to heal her body and her mind. After two years and with Katara's help, she was able to recover physically, though continued to have visions about Zaheer and the attempt on her life. In 173 AG, she set out on a journey across the world to reconnect with Raava, though to no avail. In 174 AG, while wandering through a small Earth Kingdom town, she decides to confront the vision of herself and ends up losing. However, when a small dog begs her to follow it, she does so and after passing out in a swamp after a new confrontation with her Avatar self, she wakes up in the home of Toph.

Wu is preparing for his coronation, while Mako has his doubts about the leading capabilities of the prince. At the coronation ceremony, shrunken down because most of the royal artifacts have been looted, Wu honors Kuvira with a medal, but she declares she is now in control, threatening to crush anyone who stands in the way of her new Earth Empire. Although anointed king, Wu does not command respect among his people, which Mako helps him realize. With a conflict brewing, Tenzin tasks his three eldest children to search for Korra and bring her back to Republic City. Meanwhile, Korra is training with Toph Beifong in the Foggy Swamp and finds out that there are still residual traces of mercury in her body. Toph gives up on her attempt to remove it after Korra subconsciously fought against her actions, hypothesizing Korra accepts the poison as an excuse to escape being the Avatar.

Tenzin asks his children to travel from Air Temple Island to look for Korra, as he is needed in Republic City to deal with the "Kuvira issue". Surprisingly, Jinora has a difficult time locating Korra's spiritual energy, and the lack of progress causes tensions to run high between the siblings. After befriending a couple of soldiers after being captured, Ikki is saved by Meelo and Jinora and they head to the swamp. Meanwhile, Korra is still having difficulty facing her past, and Toph takes her to the banyan-grove tree. There, Korra is able to locate the airbenders, who had been pulled into the swamp by vines. They reunite, and in Toph's home, Korra is finally able to remove the remaining mercury from her body and access the Avatar State.

Kuvira marches her entire army upon Zaofu in an attempt to coerce Suyin into surrendering the metal city to the Earth Empire, without having to take it by force. Suyin refuses, however, despite repeated warnings from both Kuvira and Korra, who went to Zaofu with Jinora, Ikki, and Meelo. Meanwhile, Varrick starts to get troubled by his conscience and refuses to further develop the spirit vine technology. When Kuvira threatens to kill him, however, he continues his work to weaponize the spirit energy. After a confrontation with the Beifong clan, Bolin questions Kuvira's methods and he ultimately decides to betray her, joining forces with Varrick and Zhu Li in an attempt to escape. Their attempt is foiled by Baatar Jr., however, and while Zhu Li pledges her loyalty to Kuvira, Bolin is sent to a reeducation camp while Varrick is forced to continue his experiments. Korra tries to talk to Kuvira, though she is only given the chance to talk Suyin into surrendering Zaofu. When she returns to talk to the matriarch, she learns from Baatar that Suyin and the twins have sneaked out to face Kuvira directly.

Suyin tries to take out Kuvira in the night, though her plan fails and she and her twin sons are taken prisoner. Kuvira announces to Zaofu what Suyin has done and tells its leaders to step forward and surrender. Korra, Jinora, and Opal walk out to stop Kuvira, who has her entire army ready to invade the metal city. Kuvira and Korra have a brief standoff, after which Korra deduces there is no other option than to fight. Kuvira proposes a one-on-one duel, in which she has the upper hand until Korra enters the Avatar State. However, plagued by her Avatar apparition once again, Korra is unable to finish her attack, enabling Kuvira to defeat her. Before Kuvira can finish Korra off, Opal and Jinora intervene, saving the Avatar, and they flee Zaofu. Baatar and Huan are subsequently arrested as they refuse to acknowledge Kuvira as their leader. Meanwhile, Bolin and Varrick are forced to continue working on weaponizing the spirit vine energy, though Varrick secretly turns the stasis tube into a bomb, destroying his research and enabling Bolin and himself to escape. However, Baatar Jr. closely observed the research and is confident he can restart the project with the help of Zhu Li.

Korra returns to Republic City with the airbenders and reunites with Tenzin. After informing him of what happened in Zaofu, she meets up with Asami and Mako for the first time in three years, though their reunion is crashed by Prince Wu and tension runs high among them. When Wu is kidnapped by supporters of Kuvira, Team Avatar tracks him to Central City Station and rescue him. To protect him from further kidnapping attempts, Wu is left at Asami's residence to stay with Mako's extended family. Meanwhile, Bolin and Varrick team up with a group of fugitive firebenders and waterbenders to cross the fortified Earth Empire border. Successfully evading arrest by the guards, they reach the shore and are given a lift in gratitude for their help. In the Foggy Swamp, Kuvira's army begins to harvest spirit vines at the banyan-grove tree.

Team Avatar reminisces about the past several years, thinking back on themselves and their friends. At the Sato estate, Mako recounts his past to Prince Wu, including how he and Korra first met and his complex relationships with both the Avatar and Asami. At Air Temple Island, Korra tells Asami how she was doubting herself and her position as bringer of balance. She felt as though the world no longer needed her as each of her enemies had thrown it out of balance despite her best efforts to maintain order. Asami is aided in her efforts to cheer Korra up by Tenzin, who tells her that the importance of facing never ending conflicts is to learn and grow from them, noting that Korra had done that. Meanwhile, Varrick relays Bolin's story to the Earth Empire fugitives as a mover-scenario in which Nuktuk plays Bolin, who defeated all of Korra's main enemies working together.

Ryu guides a group of tourists through Republic City's Spirit Wilds, though they are soon captured by the plants. Jinora, having sensed the shift in energy, comes to their help with Korra and Opal. Although they fail to track them down, Korra learns that Kuvira is harvesting vines in the Foggy Swamp. She and Opal leave to inform President Raiko about the situation, while Jinora continues her search. At City Hall, the world leaders debate about the best course of action to take against Kuvira, though their meeting is interrupted by Korra and Opal and later Varrick and Bolin. Together, they alert the leaders about Kuvira's plans and it is decided to strengthen the United Republic's borders. While Team Avatar reunites, Opal and Lin plan to leave the city to rescue their family in Zaofu by themselves. Meanwhile, Jinora warns Korra that she has been taken captive by the spirit vines. In order to save her, Korra and Mako enter the Spirit Wilds, though finding her path to the Spirit World blocked by Zaheer, Korra decides to confront him. Since Kuvira's usurpation of power is not what he had intended for the world, the airbender helps her come to terms with the fate that had befallen her and guides her into the Spirit World, where she successfully reconnects with Raava and rescues the souls of Jinora, Ryu, and the captured tourists. Meanwhile, Asami and Varrick are tasked to work together to find a defense against Kuvira's super weapon and Bolin tries to reconcile with Opal. He ends up joining her and Lin on their secret rescue mission to rescue Suyin and her family.

Opal, Bolin, and Lin travel to Zaofu, where they run into Toph, who tells them the prisoners have been moved out of the city. Bolin knows where they are and they free them. Zhu Li and Baatar Jr. have been working on a cannon to harness the spirit energy, but Zhu Li tries to sabotage the project. When Kuvira shows up, Zhu Li sabotages the weapon, hoping it would blow up the cannon, though is discovered before her plan is completed. Bolin and Opal save her while the rest of the Beifongs fight Kuvira's army. Meanwhile, in Republic City, Raiko is less than pleased with Varrick's reluctance to use spirit vines as weapons. Korra opts to ask the spirits to help defend the city against Kuvira, but they refuse, saying that they do not want to get involved in human wars.

Kuvira announces to her followers the plan to reclaim the United Republic of Nations, telling them it rightfully belongs to the Earth Empire, and after that, she talks with Baatar Jr. about their wedding and love. Bolin, the Beifongs, and Zhu Li reach Republic City, where the latter alerts Team Avatar and President Raiko of their attack plans; they thus move to prepare the city from Kuvira's attack, evacuating citizens and mobilizing the United Forces. Zhu Li tries to make up with Varrick, but leaves disgusted when he still treats her as an assistant. When Team Avatar goes to ambush Kuvira's spirit energy cannon, they discover it is mounted on a giant mecha suit controlled by Kuvira and barely escape attack. Team Avatar races back to tell Republic City of the imminent threat, but Kuvira arrives mere hours later. After seeing Kuvira show how powerful her weapon can be, Raiko surrenders. As Baatar Jr. is on the way to discuss the terms of the surrender, Korra and Tenzin's family kidnap him in order to get him to reveal how to defeat her superweapon. After Korra and Suyin unsuccessfully try to convince him, Korra threatens to never let him see Kuvira again, which causes him to break. Baatar Jr. radios Kuvira and asks her to back away from the United Republic. She appears to oblige over the radio, but actually tracks the signal and promptly fires her cannon at Team Avatar's location, destroying the facility.

Team Avatar narrowly escapes from the destroyed Future Industries factory and devises a plan to take down Kuvira's giant mecha suit. The benders try to slow the suit down, but they are unable to overcome its sheer power. Varrick tries to use an electromagnetic pulse to disable the giant mecha, but is unable to do so, only taking out one battalion of smaller mecha suits. Hiroshi Sato is temporarily released from prison to aid Asami, Varrick, and Zhu Li in engineering the hummingbird suits for use in combat. During this time, Hiroshi and Asami bury the hatchet, and Varrick successfully proposes to Zhu Li. Baatar Jr. reveals a way to disable the giant mecha and the team comes up with a plan to infiltrate the suit. Using a powerful saw rigged to the hummingbird suit, Hiroshi and Asami successfully cut a hole in Kuvira's mecha suit, allowing Korra, Mako, Bolin, Lin, and Suyin to enter; Hiroshi, however, is killed in the process.

Korra, Mako, Bolin, Lin, and Suyin have infiltrated the giant mecha suit to destroy it from the inside and split up, with Korra deciding to take on Kuvira directly, Mako and Bolin targeting the weapon's core, and the Beifongs going to disable the cannon. Lin and Suyin destroy the cannon's loading mechanism, rendering it useless. Kuvira rips off the arm with the spirit cannon with Suyin and Lin still inside and tosses it into the Spirit Wilds. Korra subsequently enters the mecha's cockpit and battles Kuvira, the two evenly matched. Mako and Bolin travel to the spirit vine core, where Mako nearly sacrifices himself to take out the core with lightning, but Bolin manages to save him. With the core unstable, the mecha suit explodes, blasting the cockpit into the Spirit Wilds. Upon leaving the wreckage, Korra tries to force Kuvira to surrender, but Kuvira manages to flee. Korra gives chase, where she finds Kuvira aiming the loose spirit energy cannon at her. Kuvira fires at Korra, but loses control of it, is unable to shut it off, and is flung off. The cannon nearly blasts her before Korra puts herself in the middle and energybends the beam around the two of them. This massive amount of spirit energy tears open a new spirit portal, warping Korra and Kuvira to the Spirit World, where Korra speaks with Kuvira and manages to emotionally relate with her, convincing her to stop the battle. Upon exiting, Kuvira tells her army to step down as she is taken away in handcuffs by Lin and Suyin. Korra shares a group hug with Bolin, Mako, the airbenders, Varrick, and Zhu Li as spirits return to Republic City. Sometime afterward, Varrick and Zhu Li get married at Air Temple Island with Bolin presiding. At the reception, Wu reveals his plan to abolish the monarchy to Korra and Mako. Korra and Mako reaffirm their friendship. Away from the dance floor, Korra and Tenzin talk at length about her growth before Tenzin runs away after Asami mentions that Varrick wishes to borrow a glider suit. Sitting with Asami, Korra apologizes for her long absence while Asami says that she is just happy to see her alive and cares deeply for Korra. Asami mentions she needs a vacation and suggests the Spirit World as a destination. Korra and Asami walk alone to the newly created spirit portal, holding hands as they cross over into the Spirit World.